720100644 has 12 divisors (see below), whose sum is σ = 1680234864. Its totient is φ = 240033544.

The previous prime is 720100621. The next prime is 720100663. The reversal of 720100644 is 446001027.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30004182 + ... + 30004205.

It is an arithmetic number, because the mean of its divisors is an integer number (140019572).

Almost surely, 2^720100644 is an apocalyptic number.

It is an amenable number.

720100644 is an abundant number, since it is smaller than the sum of its proper divisors (960134220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

720100644 is a wasteful number, since it uses less digits than its factorization.

720100644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60008394 (or 60008392 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 720100644 is about 26834.6910546777. The cubic root of 720100644 is about 896.3227090786.

The spelling of 720100644 in words is "seven hundred twenty million, one hundred thousand, six hundred forty-four".